Okla. Stat. tit. 19, § 19-901.18: Payment of bonds and other evidences of indebtedness

and interest.

Such bonds and other evidences of indebtedness and the interest

thereon shall be paid by revenue derived from an annual assessment

upon the ad valorem taxed property of the district, and all the ad

valorem taxed property of the district, including the ad valorem

taxed property of public service corporations, shall be and remain

liable to be assessed for such payments as herein provided.